This one crawled out of its salp and then swam around trying to get into another (occupied) salp.
see: http://naturewatch.org.nz/observations/3184503

See here for video clips:

https://www.youtube.com/watch?v=XmztHDCnW_Q
https://www.youtube.com/watch?v=7UK_kxvesYs
https://www.youtube.com/watch?v=ToxhH9166cM
https://www.youtube.com/watch?v=fdvCDe6ltHI